As one of the most popular anime girls of Kayoukai no Kanata, Ai Shindou is a cat Youmu and she generally takes the form of human, a young girl with long, curly brown hair and blue eyes. Ai is a sunny, cheerful and innocent girl with short sature and cute face.
As for cosplaying Kyoukai no Kanata Ai, there are mainly two anime costumes for cosplayers. One is the blue school uniform which all the school girls have at school, and another one is the unqiue Idol outfit that Ai wears it when she and four main characters catches the fruit-type Youmu.
All in all, Kyoukai no Kanata Ai Sindo cosplay is really a good idea for cute cosplayers.